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Recycling of Silica from Spent Lead-Acid Battery Separators and Reusing in FSPCM for Thermal Energy Storage

Nemati, Shervin | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52473 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Pircheraghi, Gholamreza
  7. Abstract:
  8. To reduce material consumption needed in production as well as avoiding thousands of tons of contaminations produced by spent materials in the battery industry, recycling was taken into consideration. In this study silica was recycled from spent lead-acid battery separators by the pyrolysis process. silica along with high-density polyethylene (HDPE), can be used as supporting material for fabricating form-stable phase change materials (FSPCM). FSPCMs are of great ability to be used as thermal energy storage (TES) in different parts of a building e. g. wallboards to reduce energy consumption. In this line, an eutectic mixture of lauric acid, palmitic acid and paraffin with the melting point of 33.1 oC as PCM was catered. This blend was penetrated into a structure of sintered HDPE-silica discs by a cheap procedure, the simple immersion. To evaluate microstructure and bondings of the FSPCM discs, field-emission scanning electron microscope (FESEM) and Fourier transform infrared spectroscopy (FTIR) were utilized. The results showed that, fabricated discs owned porous structure, able to house up to 75 wt. % PCM in their structures with no leakage at melting. Thermal properties like phase change temperature and heat capacity were assessed by differential scanning calorimetry (DSC). Results showed that the heat capacity of FSPCM discs reaches its maximum of 104.4 J/g which is suitable for building applications. Also, results showed that the thermal conductivity of 0.56 W.m-1.K-1 without the addition of CNTs and compressive strength of 7-14 MPa according to BS EN 771-4 standard make FSPCMs a good choice for the building materials
  9. Keywords:
  10. Thermal Energy Storage ; Phase Change Material (PCMs) ; Silica ; Pressure Strength ; Building ; Thermal Conductivity

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